llStringLength

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/LSL

StringLength

llStringLength

Summary

Function: integer llStringLength( string str );

128	Function ID
0.0	Forced Delay
10.0	Energy

Returns an integer that is the number of characters in str (not counting the null).

• string

str

Caveats

• The index of the last character is not equal to the string length.
  • Character indexs start at zero (the index of the first character is zero).

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Examples

// assumptions: 
//    object name: LSLWiki
//    script name: _lslwiki

default
{
    state_entry()
    {
        string HowLongAmI = "123";
        integer strlen = llStringLength(HowLongAmI);
        llOwnerSay( "'" + HowLongAmI + "' has " +(string) strlen + " characters.");
        // The owner of object LSLWiki will hear 
        // LSLWiki: '123' has 3 characters.
    }
}

---

• LSL-2 sees all strings as UTF8
• LSL-Mono sees all string as UTF16
• llStringLength gets the number of characters
• Both UTF8 and UTF16 use multibyte characters
• Some communication functions (e.g. llHTTPResponse) are limited by number of Bytes, and work with UTF8 strings

integer getStringBytes(string msg) {
    //Definitions:
    //msg == unescapable_chars + escapable_chars
    //bytes == unescapable_bytes + escapable_bytes
    //unescapable_bytes == unescapable_chars

    //s == unescapable_chars + (escapable_bytes * 3)
    string s = llEscapeURL(msg);//uses 3 characters per byte escaped.
    
    //remove 1 char from each escapable_byte's triplet.
    //t == unescapable_chars + (escapable_bytes * 2)
    string t = (string)llParseString2List(s,["%"],[]);
    
    //return == (unescapable_chars * 2 + escapable_bytes * 4) - (unescapable_chars + (escapable_bytes * 3))
    //return == unescapable_chars + escapable_bytes == unescapable_bytes + escapable_bytes
    //return == bytes
    return llStringLength(t) * 2 - llStringLength(s);
}

• Getting string bytes including multibyte characters

If we write bytes of msg and s as:

mb(msg bytes) = nb(no escaped bytes) + bb(before escaped bytes)

sb(s bytes) = nb + ab(after escaped bytes)

And,

ab = bb * 3 (each 1 byte like '#' becomes escaped to 3 bytes "%23"):

Then,

mb = sb - bb * 2

All escaped in s are now "%xx"(x:0-9 or A-F) forms, so, bb = number of '%'s in s.

To count '%'s, we make string t removing '%'s from s, and:

bb = sb - tb(t bytes)

(We separate s to a list removing '%'s by llParseString2List(), and again join to one string t by typecast.)

Now we got answer:

mb = sb - (sb - tb) * 2 = tb * 2 - sb

• Refer Blog(Japanese)

http://snumaw.blogspot.jp/2009/01/lsl-lldialog.html

http://jinko.slmame.com/e602732.html

See Also

Functions

•

llGetListLength

Deep Notes

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Signature
function integer llStringLength( string str );